High performance metal-supported solid oxide fuel cells with Gd-doped ceria barrier layers
2011 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 196, no 22, 9459-9466 p.Article in journal (Refereed) Published
Metal-supported solid oxide fuel cells are believed to have commercial advantages compared to conventional anode (Ni-YSZ) supported cells, with the metal-supported cells having lower material costs, increased tolerance to mechanical and thermal stresses, and lower operational temperatures. The implementation of a metallic support has been challenged by the need to revise the cell fabrication route, as well as electrode microstructures and material choices, to compete with the energy output and stability of full ceramic cells. less thanbrgreater than less thanbrgreater thanThe metal-supported SOFC design developed at Riso DTU has been improved, and an electrochemical performance beyond the state-of-the-art anode-supported SOFC is demonstrated possible, by introducing a CGO barrier layer in combination with Sr-doped lanthanum cobalt oxide (LSC) cathode. Area specific resistances (ASR) down to 0.27 Omega cm(2), corresponding to a maximum power density of 1.14 W cm(-2) at 650 degrees C and 0.6 V. were obtained on cells with barrier layers fabricated by magnetron sputtering. The performance is dependent on the density of the barrier layer, indicating Sr(2+) diffusion is occurring at the intermediate SOFC temperatures. The optimized design further demonstrate improved durability with steady degradation rates of 0.9% kh(-1) in cell voltage for up to 3000 h galvanostatic testing at 650 degrees C and 0.25 A cm(-2).
Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 196, no 22, 9459-9466 p.
SOFC, Metal-supported, Barrier layer, Magnetron sputtering, Durability
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-71631DOI: 10.1016/j.jpowsour.2011.07.014ISI: 000295602400048OAI: oai:DiVA.org:liu-71631DiVA: diva2:451839
Funding Agencies|Topsoe Fuel Cell A/S||Danish National Advanced Technology Foundation||EU|FP7-211940 (METSOFC)|NordForsk|9346|2011-10-272011-10-272013-12-12